You want to write a mobile application that will help with your monthly budget.

Question

You want to write a mobile application that will help with your monthly budget. You have decided to create a class that will do all of the calculations. Below is the pseudocode for this class.

class Budget
   Class Constructor(NewIncome, NewExpenses)
       income = NewIncome
       expenses = NewExpenses
       difference = 0
       status = "nothing"
   end class
  
   CalculateDifference
       difference = income = expenses
   end
  
   DetermineStatus
       if difference > 100 then
           status = "You saved this month"
       else if difference > 50
           status = "You did OK but watch your spending."
       else if difference = 0
           status = "You broke even"
       else
           status = "You spent more than you earned"
   end

   ReturnDifference
       return difference
   end

   ReturnStatus
       return status
   end

Which statements below CORRECTLY derives status?

A.)

Call ReturnDifference

Call ReturnStatus

B.)

Call DetermineStatus

Call CalculateDifference

C.)

Call DetermineStatus

D.)

Call CalculateDifference

Call DetermineStatus

Explanation / Answer

Method CalculateDifference calculates the difference using income and expenses variables.

Based on the expenses calculated in method CalculateDifference, status is determined in the method DetermineStatus.

___________________________________________________________________________________________________________________

Option (A)
  
   1.   Method Call ReturnDifference returns difference which is not yet processed.
   2.   Method Call ReturnStatus returns status which can't be derived with out processing difference.
  
   Hence this is not the correct option
  
___________________________________________________________________________________________________________________

Option (B)
  
   1.   Method Call DetermineStatus determines status with the help of difference which is not yet processed.
   2.   Method Call CalculateDifference calculates difference.
  
   But the order of calls results in incorrect value for variable status.
  
   Hence this is not the correct option
  
___________________________________________________________________________________________________________________

Option (C)
  
   1.   Method Call DetermineStatus determines status with the help of difference which is not yet processed.
  
   So the function call results in incorrect value for variable status.
  
   Hence this is not the correct option
  
___________________________________________________________________________________________________________________

Option (D)
  
   1.   Method Call CalculateDifference calculates difference first.
   2.   Method Call DetermineStatus determines status with the help of difference processed in CalculateDifference function call.
  
   So the order of calls results in correct value for variable status.
  
   Hence this is the correct option

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